The potentials of hybrid technology for emissions and fuel consumption reduction result from the  combination of following functions:

• Electric driving
• Downsizing of combustion engine
• Regenerative Braking: Parts of the braking energy will be covered by the generator function of the hybrid system.
• Start/Stop function: Automatic engine turn off at vehicle stop.

The following diagrams demonstrate the increase in performance (acceleration and torque) achieved in a vehicle with various types of hybrid drives: